Abstract
Floods are among the most dangerous natural disasters that affect the
development of a region. Flood events worldwide cause the utmost
casualties and property damage. Increasing urbanization and population
have significant impacts on the natural environment. Human activities
such as uncontrolled building constructions in urban areas, land use
changes and lack of urban planning, all affect floods. In urban flood
management, determining the size and risk areas of the flood is
extremely important in order to reduce the possible losses. In this
study, five basins which have been experiencing floods caused by climate
change and increasing urbanization in Bodrum, which is one of Turkey’s
most important tourism centers, have been examined. Maximum flood flow
rates were calculated in these basins by using Soil Conservation-Curve
Number (SCS-CN) precipitation-flow model with the effect of urbanization
changes in 1984, 2010, 2011 and 2019. Flood hydrographs of the basins
for the years studied were determined. In addition, Multiple Criteria
Decision Making (MCDM) model was used to create flood risk maps of
basins. As a result of the study, it was determined that the increase in
urbanization in the period from 1984 to 2019, caused the flood flows to
increase as well as the areas at risk to increase. The flood problems
caused by urban growth and distorted urbanization were identified and
measures and suggestions to be taken in urban flood management were
introduced.